diff --git a/research_phase/gradient_boosting_model.ipynb b/research_phase/gradient_boosting_model.ipynb
index 2ddc960..6cb434e 100755
--- a/research_phase/gradient_boosting_model.ipynb
+++ b/research_phase/gradient_boosting_model.ipynb
@@ -22,7 +22,7 @@
     "# from sklearn.pipeline import Pipeline\n",
     "# from sklearn.compose import ColumnTransformer\n",
     "\n",
-    "from feature_engine.categorical_encoders import RareLabelCategoricalEncoder\n",
+    "from feature_engine.encoding import RareLabelEncoder\n",
     "\n",
     "# to visualise al the columns in the dataframe\n",
     "pd.pandas.set_option('display.max_columns', None)"
@@ -684,7 +684,7 @@
    "source": [
     "### Separate dataset into train and test\n",
     "\n",
-    "Before beginning to engineer our features, it is important to separate our data intro training and testing set. This is to avoid over-fitting. This step involves randomness, therefore, we need to set the seed."
+    "### Before beginning to engineer our features, it is important to separate our data intro training and testing set. This is to avoid over-fitting. This step involves randomness, therefore, we need to set the seed."
    ]
   },
   {
@@ -1035,7 +1035,7 @@
    "source": [
     "# remove rare caregories\n",
     "\n",
-    "rare_enc = RareLabelCategoricalEncoder(tol=0.01, n_categories=5, variables = vars_cat)\n",
+    "rare_enc = RareLabelEncoder(tol=0.01, n_categories=5, variables = vars_cat)\n",
     "rare_enc.fit(X_train)\n",
     "X_train = rare_enc.transform(X_train)\n",
     "X_test = rare_enc.transform(X_test)"
diff --git a/research_phase/requirements.txt b/research_phase/requirements.txt
index 3d247ba..9b1953d 100644
--- a/research_phase/requirements.txt
+++ b/research_phase/requirements.txt
@@ -1,9 +1,10 @@
 # We use compatible release functionality (see PEP 440 here: https://www.python.org/dev/peps/pep-0440/#compatible-release)
 # to specify acceptable version ranges of our project dependencies. This gives us the flexibility to keep up with small
 # updates/fixes, whilst ensuring we don't install a major update which could introduce backwards incompatible changes.
-numpy>=1.20.0,<1.21.0
-pandas>=1.3.5,<1.4.0
-scikit-learn>=1.0.2,<1.1.0
-jupyter>=1.0.0,<1.1.0
-feature_engine>=0.3.1,<0.4.0
-matplotlib>=3.1.2,<4.0.0
\ No newline at end of file
+
+numpy>=1.20.0,<1.25.0;python_version>="3.8" and python_version<"3.12"
+pandas>=1.5.0,<2.1.0;python_version>="3.8" and python_version<"3.12"
+scikit-learn>=1.2.0;python_version>="3.8" and python_version<"3.12"
+jupyter>=1.0.0,<1.1.0;python_version>="3.8" and python_version<"3.12"
+feature-engine>=1.5.0,<=1.6.2;python_version>="3.8" and python_version<"3.12"
+matplotlib>=3.1.2,<4.0.0;python_version>="3.8" and python_version<"3.12"
\ No newline at end of file